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ORACLE DBA – Tips and Techniques

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    • DBA Sheet v7.0
    • OS-DB-Commands
    • Database-Scripts
    • Generate INSERT statements from the SELECT query
    • Generate INSERT statements to a flat file using a PL/SQL query
  • Oracle
    • DB-Install
      • Install Oracle AI Database 26ai
      • Install 19c GUI
      • Install 19c in silent mode
      • Install 18c
      • Install 12.2 Database Binaries in silent mode
      • Install Oracle Software in silent mode 11gR2
      • Install 10g
      • Deinstall Oracle 11gR2 Database binaries
      • Deinstall Oracle 18c Database Binaries
      • Oracle 19c Deinstall
      • Uninstall Oracle Client on Windows
    • DB-Upgrade
      • Upgrade DB using DBUA from 11.2.0.4 to 12.2.0.1
      • Upgrade DB Manually 11.2.0.4 to 12.2.0.1
      • Upgrade Oracle Database from 12.2.0.1 to 19c using DBUA
      • Upgrade Oracle Database Manually from 12.2.0.1 to 19c
      • Rolling Upgrade With an Existing Physical Standby Database
      • Upgrade TIMEZONE Version
      • Upgrade Database to 12.2 with Physical Standby
    • Patching
      • Patch Terminology
      • Apply Patch RU on Database 19c
      • 18c DB Patching
      • 18c DB Patching – Youtube
      • Apply RU on DATABASE 12.2 (CDB/PDB)
      • ROLLBACK RU from DATABASE 12.2
      • Apply DB PSU on Standby
    • DB-Admin
      • Oracle Container Database (CDB)
        • CREATE NEW PDB BY CLONING AN EXISTING PDB
        • CREATE PDB USING DBCA
        • CREATE PDB USING SEED
        • DROP PDB MANUALLY
        • STARTUP/SHUTDOWN CDB AND PDB
        • Convert Non-CDB to PDB with DBMS_PDB
        • SCHEMA REFRESH FROM 11G TO 12C PDB
      • Non-CDB
        • Store DB credentials in Oracle Wallet
        • Create database -DBCA silent mode
        • Drop Database
        • Delete database -DBCA silent mode
        • DBT-06103 The port (1,522) is already used – DBCA
        • Create DB 19C – DBCA-GUI
        • Create DB 19C – DBCA-SILENT
        • CREATE NON-CDB ON ORACLE 12C IN SILENT MODE
        • Configure OEM Express 12c
        • Create Non-CDB on Oracle 12c using DBCA (GUI)
        • How to Change MAX_STRING_SIZE on Physical Standby Environment
        • How to change SQL  prompt to show connected user and database name
        • Enable Archivelog
        • Change Archive Dest
        • How to Recover Loss of DATA – (Without a Backup!)
        • Configure OEM DBConsole manually
        • Proxy User
        • Database Link
        • DBMS_SCHEDULER
        • Enable/Disable JOBS during Maintenance
        • ORA-00054
        • Blocking Sessions
        • Create Service using DBMS_SERVICE
        • Error TNS-12543
      • Under Edit
    • Backup & Recovery
      • How to Recover Loss of DATA – (Without a Backup!)
      • BACKUP ORACLE HOME AND INVENTORY
      • SCHEMA REFRESH FROM 11G TO 12C PDB
      • RMAN-CATALOG
      • RMAN Database Restore RAC – RAC
      • RMAN Database Restore ASM – ASM
      • RMAN Database Restore from ASM to File System
      • RMAN ACTIVE DUPLICATION ASM TO ASM
      • Backup Based RMAN Duplicate Database
  • ExaData
    • Oracle Exadata – Overview
    • Exadata DB Server (Compute Node)
    • Exadata Storage Server (Cell Node)
    • ExaData infi Network
    • Exadata Part Replacement Runbook
    • CellCLI Commands
  • P.Tuning
    • Tuning Stage 1
      • Statistics
      • Oracle Histograms
      • Export/Import schema statistics
      • CONTROL MANAGEMENT PACK ACCESS
      • Generate Explain Plan
      • SQL Query is really hanged or not
    • Tuning Stage 2
      • STATSPACK
      • ASH
      • AWR
      • Colored SQL_ID
      • SYSAUX Tablespace
    • Tuning Stage 3
      • Troubleshooting Long Running Queries
      • SQL Tuning Advisor
      • SQLT
        • How to Install SQLT
        • How to Run SQLT
        • How to Create Custom SQL Profile
        • Uninstall SQLT
      • Tracing
      • TRCA – Trace Analyzer
    • FF Analysis (Advanced Troubleshooting) – Internal Only
      • Fire-Fighting Analysis (Ongoing / Live Issues)
        • Explain Plan Analysis
        • Top SQL Analysis
        • 10046 Trace Analysis
        • 10053 Trace Analysis
      • Forensic Analysis (RCA – Completed Issues)
  • HA
    • CONFIGURATION
      • Active Dataguard on Non-ASM
      • Active Dataguard on ASM
      • Convert Physical Standby Database to Snapshot Standby Database
      • Convert Snapshot Standby database to Physical Standby database
      • Configure Cascading Standby Database
      • DG Broker Configuration
      • DG Broker Error – ORA-16714
      • Disable DG Broker
      • 12.2 Active Dataguard in CDB on Non-ASM
      • Create Physical Standby using RMAN Backup Without Duplicate Command
      • Create Physical Standby using RMAN Backup with Duplicate Command
      • 12c DG Broker Configuration
    • SWITCHOVER
      • Switchover Manual No-Broker
      • Switchover with Broker
    • FAILOVER
      • Failover with Broker(No Flashback)
      • Failover with No Broker (No Flashback)
      • Failover with Broker using Flashback
      • Failover with No Broker using Flashback
    • Enable Real-Time Apply
    • Refresh Standby Database using RMAN Incremental SCN Backup
    • Resetlogs on Primary where Standby in place
    • Drop SRL
  • RAC
    • Create users, groups and Paths for Oracle RAC
    • Configure ASMLib for Oracle ASM
    • Configure UDEV Rules for Oracle ASM
    • ASM
      • Move ASM Spfile to diff. DiskGroup
      • ASM Commands
      • Instantiating disk: failed
      • CSSD won’t start automatically
    • RAC Install
      • RAC Install 11.2.0.3
      • Upgrade GI to 11.2.0.4
      • Downgrade GI to 11.2.0.3
      • root.sh failed with ORA-29783 on RAC
      • Delete Node
      • Add Node
      • Delete Node without remove software
      • Add Node Back which was DELETED without remove software
    • RAC Admin
      • How to take OCR backup on 11.2.0.4
      • Cluster Name
      • Move/Relocate OCR
      • Restore loss of all VOTE disk
      • Cluster Startup issues
      • Add SCAN
    • RAC Tools
      • CLUVFY
      • OSWatcher
    • RAC Standby 12.2
    • Create ACFS File System on RAC
  • GG
    • GoldenGate Installation
    • Unidirectional DML Replication
    • Zero Downtime Migration
    • DDL Replication
    • GoldenGate 12C Installation
    • Integrated Capture
    • Oracle GoldenGate Heterogeneous Replication
    • Credential Store
    • ADD NEW TABLE TO AN EXISTING GOLDENGATE CONFIGURATION
    • Install Oracle GoldenGate 19C for Database 12C
    • Install Oracle GoldenGate 19C for Database 19C
  • OEM
    • Install OEM 13.2
    • Install OEM 13.3
    • Add Targets Manually on EM Cloud Control 13c
    • Upgrade OMSPatcher
    • Apply Patch on OMS 13.1
    • Apply Patch on Agent 13.1
  • SQL Server
    • SQL Server Basics
    • Install Microsoft SQL Server Express 2014
    • Install Only SQL Server Management Studio
    • Create Database using GUI
    • Enable TCP/IP Connection
    • Allow Remote Connection
    • Authentication Method
    • Create a new domain user account in Windows
    • Create Windows Authentication Login
    • Create SQL Server Authenticated Login in SQL Server
    • Create Windows Group Authentication Login in SQL Server
    • SQL Server – Recovery Models
    • Database Backup-FULL-DIFFERENTIAL-TLOG
    • Restore Database without Tail-log Backup
    • Restore Database with Tail-log Backup
    • Log Shipping (SQL Server 2022)
    • Windows Server 2022 Failover Cluster
    • Setup 4 Node Always On Availability Group
    • Who is NT AUTHORITY\SYSTEM?
    • Add Database to Existing AG using Backup and Restore
    • Manual Failover (Planned)
    • Automatic Failover (Unplanned)
  • MySQL
    • Install MySQL 8 on Linux 7 Using RPM Packages
    • Create MySQL Database
    • Create New User Account in MySQL
    • Grant Privileges in MySQL
    • Create Roles in MySQL
    • How To Backup MySQL Database Using mysqldump
    • How to Restore Database from Single MySQL Database Backup
    • How to Restore A Single Database From A Backup File Which Contains Multiple Databases
    • How To Restore Single Table From Full Database Backup in MySQL
    • How To Configure MySQL Master-Slave Replication?
  • PostgreSQLNew
    • PostgreSQL Installation & Basics
      • PostgreSQL Versions & Features
      • Install PostgreSQL 15 using yum Repository on Linux
      • Install PostgreSQL Using Source Code
      • Install PostgreSQL 17.4 from Source code
      • How to START/STOP PostgreSQL 13 on Linux
      • Create Database in PostgreSQL
    • PostgreSQL Security & User Management
      • PostgreSQL User Management
      • pg_hba conf
    • PostgreSQL Storage & Architecture
      • PostgreSQL Architecture
      • initdb – PostgreSQL Cluster Initialization
      • PostgreSQL DBA Terminology
      • PostgreSQL vs Oracle Terminology
      • PostgreSQL Tablespace Internals
      • Change Data Directory
      • WAL Files
      • Change pg_wal path
      • PostgreSQL Tablespace
    • Backup & Recovery
      • Enable Archive Mode
      • Disable ARCHIVELOG
      • Logical – pg_dump and pg_restore (Backup & Restore)
      • Logical – pg_dumpall (Backup & Restore)
      • Physical – pg_basebackup (Backup and Restore)
      • Backup & Restore to Another Host (No Archive Mode)
      • Backup & Restore on Same Host
      • Restore PostgreSQL to New Host using pg_basebackup + WAL Archives
      • PostgreSQL PITR – Point in Time Recovery
    • High Availability
      • Streaming Replication
      • Manual Failover – Streaming Replication
      • Synchronous Replication
    • PostgreSQL DBA Interview QuestionsNew
      • Beginner Level
      • Intermediate Level
      • Advanced Level
    • PostgreSQL DBA ScriptsNew
    • Replication Manager (repmgr)
      • PostgreSQL HA Setup with REPMGR + Automatic Failover
    • Patroni HA
      • etcd Cluster Setup
      • Patroni and Postgres
      • Haproxy (Load Balancer)
      • Keepalived VIP
    • Oracle to PostgreSQL via ora2pg
    • EDB Postgres
  • DB2
    • Install DB2 V10.5 using GUI
    • DB2 STOP and START
    • DB2 Troubleshooting Guide
  • DevOps
    • Install and Configure Git on Linux 9
    • How to Install Jenkins on Linux
    • Install Docker on Linux
    • Docker Cheat Sheet

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Published on December 30, 2025 in Always On Availability GroupFull resolution (405 × 493)
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About me - Rajasekhar Amudala